background Psychiatric disorders in adults often result from psychiatric problems during childhood and adolescence. aim In the light of prevention of psychiatric disorders in adults, we focus on adolescence. method Based on the working method of the transitional psychiatry unit, we describe the characteristics of the patient group and the necessities of adequate treatment and care for young people who are suffering from a stagnation in development due to psychiatric problems. results Family therapy, new authority/non-violent resistance and our own RAISING skills are tools for treating these young people. Here we focus on the adolescent’s development. This early treatment prevents the development of irreversible symptoms and serious psychiatric illness during adulthood. conclusion Transitional psychiatry forms part of the answer in the search of pro-active medicine. Tijdschrift voor Psychiatrie 63(2021)2, 115-119